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http://news.bbc.co.uk/2/hi/entertainment/4463797.stm>>
>>Movie version. Looks interesting; I heard a lot about the books, but I wasn't able to get hold of a copy yet.
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>The books are great if you are into "weird" sci-fi books :) I enjoyed reading all the books (If I recall correctly the trillogy had four books :))
>Check out your local library, I am sure they have the books or maybe they can order them from another library.
>I just did a quick search on Amazon.com and I found many hits both book and audio.
According to the Wikipedia, the "trilogy" eventually expanded to 5 books.
...It wasn't truly clear that the series was over (since it was already a trilogy with five books) until Adams died of a heart attack at age 49 in 2001. Indeed, Adams said that the new novel he was working on, The Salmon of Doubt, was not working as a Dirk Gently story, and suggested it might instead become a sixth book in the Hitchhiker's series. ...
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)